Mask US phone number string with JavaScript

Question

I need regular express for US Phone Number format.I want to replace the phone number string into below US phone number string format in JavaScript.

var number = "4031234789";

And I want to mask it in below format:-

number = number.mask('[phone]');

Can anyone show me a regular expression for that in JavaScript?

Answer 1

You can use regular expression and then concatenate to form your string.

var USNumber = "4031234789".match(/(\d{3})(\d{3})(\d{4})/);<br/>
USNumber = "(" + USNumber[1] + ") " + USNumber[2] + "-" + USNumber[3];

Answer 2

Use phone number masking plugins for that.

Check the following plugins:

• http://wiki.jqueryui.com/w/page/12137996/Mask

• http://igorescobar.github.io/jQuery-Mask-Plugin/

• http://digitalbush.com/projects/masked-input-plugin/

Answer 3

You can use my package https://github.com/jsonmaur/coverup, which can mask the input string onblur and maintain the symbols in the string.

Answer 4

This answer assumes you want the following format: [phone] (as the OP states).

^{There are multiple different ways to implement this, but here are a couple different approaches:}

---

If you want to simply mask the number on the blur event (when the field loses focus), then you could use the following:

document.getElementById('phone').addEventListener('blur', function (e) {
  var x = e.target.value.replace(/\D/g, '').match(/(\d{3})(\d{3})(\d{4})/);
  e.target.value = '(' + x[1] + ') ' + x[2] + '-' + x[3];
});

<p>Masked on the blur event (remove focus).</p>
<input type="text" id="phone" placeholder="[phone]"/>

---

Alternatively, if you would rather mask the number while typing, you can listen to the input event and then conditionally mask the number based on the regex match:

document.getElementById('phone').addEventListener('input', function (e) {
  var x = e.target.value.replace(/\D/g, '').match(/(\d{0,3})(\d{0,3})(\d{0,4})/);
  e.target.value = !x[2] ? x[1] : '(' + x[1] + ') ' + x[2] + (x[3] ? '-' + x[3] : '');
});

<input type="text" id="phone" placeholder="[phone]"/>